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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders' Equity [Abstract]  
Stock option and restricted stock activity
The following table summarizes stock option and restricted stock activity for the Plan:

    
Stock Options
  
Restricted Shares
 
  
Shares Available for Grant
  
Shares
  
Weighted Average Exercise Price Per Share ($)
  
Shares
  
Weighted Average Exercise Price Per Share ($)
 
           
Balance January 1, 2012
  
1,677,738
   
1,573,974
  
$
27.10
   
252,024
  
$
27.21
 
Granted
  
(345,696
)
  
222,250
   
32.04
   
123,446
   
32.04
 
Exercised/vested
  
-
   
(330,158
)
  
25.15
   
(102,424
)
  
25.90
 
Canceled
  
159,932
   
(70,546
)
  
27.76
   
(89,386
)
  
27.08
 
Balance December 31, 2012
  
1,491,974
   
1,395,520
   
28.31
   
183,660
   
31.25
 
Granted
  
(351,995
)
  
239,770
   
41.42
   
112,225
   
41.44
 
Exercised/vested
  
-
   
(501,222
)
  
25.26
   
(61,981
)
  
28.09
 
Canceled
  
50,985
   
(2,653
)
  
37.24
   
(48,332
)
  
31.59
 
Balance December 31, 2013
  
1,190,964
   
1,131,415
   
32.42
   
185,572
   
37.65
 
Granted
  
(279,184
)
  
173,068
   
58.25
   
106,116
   
58.94
 
Exercised/vested
  
-
   
(323,636
)
  
30.57
   
(61,621
)
  
36.51
 
Canceled
  
84,806
   
(29,768
)
  
41.88
   
(55,038
)
  
38.73
 
Balance December 31, 2014
  
996,586
   
951,079
   
37.46
   
175,029
   
50.56